Water-tube boiler



April 27 1926. 1,582,097

P. THOMSEN WATER TUBE BOILER Filed Jan 2, 1923 WITNESS E 70 c v PETE/f 77/0M5EA/ )Q- l vvt al/J/tapn wim Patented Apr. 27, 1926.

UNITED STATES IPETEB, THOMSEN, 0F CASSEL, GERMANY, ASSIGNOR TO SCHMIDT SCHE HEISSDAMPF- GESELLSGHAFT M. 13. OF GERMANY.

11., or CASSEL-WILHELMSHOHE, GERMANY, A conrona'rron' WATER-TUBE BOILER.

Application fll'ed il'anuai'y 2, 1923. Serial nb. 61o,227.

To all whom. it may concern:

Be it known that 1, PETER THOMSEN, a citizen of Germany, and resident of Cassel, Germany, have invented certain new and useful improvements in Water-Tube Boilers,

of which the following is a specification.

This invention relates to water tube boilers and particularly to those of the Yarrow type, comprising a superheater and three drums, one upper one and two lower ones, the latter being connected with the upper drum by substantially straight tubes. The object of my present invention is to provide an arrangement which will enable the superheating action to be regulated as required at different times.

The particular features by which I attain this object will now be described in connection with the accompanying drawing, which is avertical section showing as an example a typical form of my invention.

At a I have indicated the upper drum of the boiler which is connected with the semi-cylindrical water drums I) located at the bottom by straight inclined tubes 0. The, furnace gases coming from the space located between said lower drums b are directedto hot gas fines located at each side of the boiler, and these flues areshown divided into two upwardly extending branches or ducts d 6 respectively by means of an upright partition f, the lower end of which is located substantiallyat the middle of the outer water tubes 0.- At one of these branches 0? is located the superheater g of any usual or approved construction. The other branch or conduit 6 contains a damper h. In the particular construction illustrated, the superheater at the left of the boiler is contained in the inner branch or conduit, while on the right-hand side of the boiler the superheater is located in the outer branch of the hot gas flue.

When starting the boiler or at such times as only relatively low superheating temperatures is required, the dampers It will be placed in their open position. Thus the greater part of the hot gases on each side of the boiler will pass across the water tubes 0 and then up through the branches e which contain no superheater and which therefore ofl'e'r less resistance to the flow of the gases. Onl a small portion of the gases will go through the branches d in which the superheaters g are arranged. Combustion will thus be promoted but the superheating action will be reduced. During the normal operation, however, a less actlve generation of steam is desired, with an increase in the heating action at the superheaters g. For this purpose the dampers h will be closedso that nearly onehalf of the heating surface of the boiler at each side thereof will be cut oif from steam generation. As the hot gases thus come in contact with only a relatively small portion of the boiler surface, they retain a higher temperature and thus are able to act more efi'ecti'vely on the superheaters' 9 than if they enter the branches or conduits d. It will be noted that the travel of the gases is always upward in the branches or conduits cl e whether the dampers h are open or closed; that is, there is no reversal of a gas flow when the position of the dampers is changed.

\Vhile I have illustrated superheaters on both side of the boiler, it will be readily understood that either one of the superheaters shown may be omitted and, in some cases, such a one-sided arrangement will afford quite satisfactory results. It will also be understood that by adjusting the damper or dampers h to difi'erent positions, 1 can regulate, in various ways, the proportion of hot gases flowing through the superheaters and through the open branches 6 respectively, so that the heating action in V the superheaters can be regulated with great nicety.

1 claim:

1. A water tube boiler comprising ah upper drum, lower drums, water tubes connecting the lower drums with the upper drum, hot'gas flues for directing the (301111 bustion gases across said .water tubes between the upper drum and the lower drums, partitions sub-dividing said fiues into outer and inner branches, said partitions extending downwardly to about the middle portion of said water tubes, superheaters in one branch of each hot gas flue and dampers in the other branches of said-flues.

2. A water tube boiler comprising an upper drum, lower drums, inclined water tubes connecting said lower drums with the upper drum, hot gas fines for conducting the combustion gases across said water tubes between said upper and lower drums, upright partitions extending in said flues to about the middle portion of the outer Water tubes and subdividing said fiues into inner and outer branches, superheaters located in one branch of each flue and dampers located in the other branches of said flues.

3. A water tube boiler comprising an upper drum and lower drums, water tubes connecting said lower drums with the upper drum, hotgas fines for conveying the combustion gases across said Water tubes, a partition subdividing one of said flues into two branches and extending to about the middle portion of said Water tubes, 21 superheater located in one of said branches and a damper located in the other branch.

4. A water tube boiler comprising an upper drum, lower drums inclined water tubes connecting said lower drums with said upper drum, hot gas fines for conveying the combustion gases across said water tubes, an upright partition sub-dividing one of said fiues into two branches and extending downwardly to about the middle of the outer Water tubes, a superheaterlocated in one of said branches and a damper located in the other branch.

PETER THOMSEN. 

